diff options
| author | Fabian Vogt <fvogt@suse.com> | 2016-09-26 14:26:49 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-11-28 20:09:50 -0500 |
| commit | cb97ad47bfa365128927438b94065fa900838770 (patch) | |
| tree | d3d5011661ae6b1c798eacc64bdd9d5a50168d38 | |
| parent | ff5d7ae713ac6de37f3a93f3a4fed13ab4ffd154 (diff) | |
serial: bcm283x_mu: support disabling after initialization
For the Raspberry Pi 3 it needs to be possible to disable the serial
device after initialization happens, as only after the GPIO device is available
it is known whether the mini uart is usable.
Signed-off-by: Fabian Vogt <fvogt@suse.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | drivers/serial/serial_bcm283x_mu.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/serial/serial_bcm283x_mu.c b/drivers/serial/serial_bcm283x_mu.c index e361909013..3884f744cd 100644 --- a/drivers/serial/serial_bcm283x_mu.c +++ b/drivers/serial/serial_bcm283x_mu.c @@ -59,7 +59,7 @@ static int bcm283x_mu_serial_setbrg(struct udevice *dev, int baudrate) struct bcm283x_mu_regs *regs = priv->regs; u32 divider; - if (plat->skip_init) + if (plat->disabled || plat->skip_init) return 0; divider = plat->clock / (baudrate * 8); @@ -85,10 +85,14 @@ static int bcm283x_mu_serial_probe(struct udevice *dev) static int bcm283x_mu_serial_getc(struct udevice *dev) { + struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev); struct bcm283x_mu_priv *priv = dev_get_priv(dev); struct bcm283x_mu_regs *regs = priv->regs; u32 data; + if (plat->disabled) + return -EAGAIN; + /* Wait until there is data in the FIFO */ if (!(readl(®s->lsr) & BCM283X_MU_LSR_RX_READY)) return -EAGAIN; @@ -100,9 +104,13 @@ static int bcm283x_mu_serial_getc(struct udevice *dev) static int bcm283x_mu_serial_putc(struct udevice *dev, const char data) { + struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev); struct bcm283x_mu_priv *priv = dev_get_priv(dev); struct bcm283x_mu_regs *regs = priv->regs; + if (plat->disabled) + return 0; + /* Wait until there is space in the FIFO */ if (!(readl(®s->lsr) & BCM283X_MU_LSR_TX_EMPTY)) return -EAGAIN; @@ -115,9 +123,15 @@ static int bcm283x_mu_serial_putc(struct udevice *dev, const char data) static int bcm283x_mu_serial_pending(struct udevice *dev, bool input) { + struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev); struct bcm283x_mu_priv *priv = dev_get_priv(dev); struct bcm283x_mu_regs *regs = priv->regs; - unsigned int lsr = readl(®s->lsr); + unsigned int lsr; + + if (plat->disabled) + return 0; + + lsr = readl(®s->lsr); if (input) { WATCHDOG_RESET(); |